Journal
LIMNOLOGY AND OCEANOGRAPHY LETTERS
Volume 3, Issue 3, Pages 275-284Publisher
WILEY
DOI: 10.1002/lol2.10077
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Funding
- Nordforsk (DOMQUA project) [60501]
- Norwegian Research Council (Ecco project) [224779/E10, 244558, 208279, 82263]
- Norwegian Environment Agency
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Are small lakes passive pipes transporting terrigenous organic carbon (dissolved organic carbon [DOC]), or chimneys for CO2 release in the landscape? Using a unique combination of 30-yr measurements, sediment dating and modeling of a small humic lake and its catchment in southeast Norway, we calculated lateral DOC fluxes and in-lake retention. Concentrations and fluxes rose significantly, driven by declining sulfur deposition and increased precipitation. In-lake retention (% of inputs) declined because of higher discharge and lower residence times. DOC removal rates were not sensitive to residence time. Modeled in-lake DOC removal was driven primarily by microbial metabolism and, secondarily, by flocculation, suggesting that the likely fate of lake-retained DOC is CO2 evasion to the atmosphere. Precipitation was the overriding landscape control on DOC fluxes and retention. In a wetter climate, small northern lakes will, on balance, function more as pipes than chimneys, with increasing lateral DOC fluxes but little change in CO2 production.
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